Python - 用特定字符的字符串过滤元组
给定一个元组列表，提取具有由特定字符组成的字符串的元组。
Input : test_list = [(‘gfg’, ‘best’), (‘gfg’, ‘good’), (‘fest’, ‘gfg’)], char_str = ‘gfestb’
Output : [(‘gfg’, ‘best’), (‘fest’, ‘gfg’)]
Explanation : All tuples contain characters from char_str.
Input : test_list = [(‘gfg’, ‘best’), (‘gfg’, ‘good’), (‘fest’, ‘gfg’)], char_str = ‘gfstb’
Output : []
Explanation : No tuples with given characters.
方法 #1：使用all() +列表推导式
在这里，我们检查字符中的字符串，使用 in运算符和 all() 用于检查元组中的所有元素是否具有由某些字符组成的字符串。
Python3
# Python3 code to demonstrate working of
# Filter Tuples with Strings of specific characters
# Using all() + list comprehension
# initializing lists
test_list = [('gfg', 'best'), ('gfg', 'good'), ('fest', 'gfg')]
# printing original lists
print("The original list is : " + str(test_list))
# initializing char_str
char_str = 'gfestb'
# nested all(), to check for all characters in list,
# and for all strings in tuples
res = [sub for sub in test_list if all(
all(el in char_str for el in ele) for ele in sub)]
# printing result
print("The filtered tuples : " + str(res))Python3
# Python3 code to demonstrate working of
# Filter Tuples with Strings of specific characters
# Using filter() + lambda + all()
# initializing lists
test_list = [('gfg', 'best'), ('gfg', 'good'), ('fest', 'gfg')]
# printing original lists
print("The original list is : " + str(test_list))
# initializing char_str
char_str = 'gfestb'
# nested all(), to check for all characters in list,
# and for all strings in tuples filter() is used
# to extract tuples
res = list(filter(lambda sub: all(all(el in char_str for el in ele)
for ele in sub), test_list))
# printing result
print("The filtered tuples : " + str(res))输出：
The original list is : [(‘gfg’, ‘best’), (‘gfg’, ‘good’), (‘fest’, ‘gfg’)]
The filtered tuples : [(‘gfg’, ‘best’), (‘fest’, ‘gfg’)]
方法 #2：使用filter() + lambda + all()
与上述方法类似，不同之处在于 filter() + lambda 用于执行过滤任务。
蟒蛇3
# Python3 code to demonstrate working of
# Filter Tuples with Strings of specific characters
# Using filter() + lambda + all()
# initializing lists
test_list = [('gfg', 'best'), ('gfg', 'good'), ('fest', 'gfg')]
# printing original lists
print("The original list is : " + str(test_list))
# initializing char_str
char_str = 'gfestb'
# nested all(), to check for all characters in list,
# and for all strings in tuples filter() is used
# to extract tuples
res = list(filter(lambda sub: all(all(el in char_str for el in ele)
for ele in sub), test_list))
# printing result
print("The filtered tuples : " + str(res))
输出：
The original list is : [(‘gfg’, ‘best’), (‘gfg’, ‘good’), (‘fest’, ‘gfg’)]
The filtered tuples : [(‘gfg’, ‘best’), (‘fest’, ‘gfg’)